MTN wrongfully recycling our mobile numbers

MTN wrongfully recycling our mobile numbers under their 2 month no recharge period. Contacted their filthy rude call centre and got nowhere but having the phone slammed down on us. No help at all from these chaps as they persist with insisting that due to us not recharging our numbers it gets deleted, but all within their 2 month and 3 month period as 2 different rude call centre ladies explained. So what is it?? No recharge 60 days and our number gets recycled or 90 days ??? In which case, my number is still well within it's time frame to either be recharged and then deleted if not recharged. Not sure what's going on. Rude and pathetic call centres certainly dont remedy our issues.